A Gem Knight casts divine spells (the same type of spells available to the Clerics, druids, paladins, and rangers), which are drawn from the Gem Knight spell list (See sheet "Spellbook"). When a Gem Knight gains access to a new level of spells, he automatically knows all the spells for that level listed on the Gem Knight's spell list. Essentially, his spell known list is the same as his spells list (See sheet "Spellbook").

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To cast a spell, a Gem Knight must have a Wisdom score of 10 + the spell’s level (Wis 10 for 0-level spells, Wis 11 for 1st-level spells, and so forth). The Difficulty Class for a saving throw against a Gem Knight's spell is 10 + the spell’s level + the Gem Knight's Wisdom modifier. Like other spellcasters, a Gem Knight can cast only a certain number of spells of each spell level per day. His base daily spell allotment is given on sheet "Leveling Table". In addition, he receives bonus spells for a high Wisdom score (See Table 1-1 - Players Handbook I p.8).

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Unlike a Cleric or a wizard, a Gem Knight need not prepare his spells in advance. He can cast any spell he knows at any time, assuming he has not yet used up his spells per day for that spell level.